Grinding machine



March 24, 1925 F. E. GARDNER GRINDING MACHINE 5 Sheets-Sheet 1 FiledJune 20, 1921 5 Sheets-Sheet 2 M&

March 24, 1925.

v F. E. GARDNER GRINDING MACHINE Filed-June 20, 1921 jrzaizfoz/ II I I v'VIWIIIIIIIIIIAIIIIII I w March 24, 1925.

F. E. GARDNER GRINDING MACHINE 5 Sheets-Sheet Filed June 20, 1921 March24, 1925. A 41,530,488

- F; E. GARDNER GRINDING MACHINE v Filed June 20; 1921 5 Sheets-Sheet 4.

ii I! llllllllllllll' March 24, 1925. 1,530,488

F. E. GARDNER GRINDING MACHINE Filz ad June 5,0,j921 Sheets-Sheet 5 fieak z'c 54745762 I Patented Mar. 24, 1925.

nnnnnnio n. GARDNER, or BELOIT, W sconsin.

GRINDING MACHINE.

' Application filed 'Iune20, 1921. Serial No. 478,829.

To all whom it may concern:

Be it known that I, FREnnRio E. GARD NEH, a citizen of the UnitedStates, residing at Beloit, in the county of Rock and State ofWisconsin, have invented certain new and useful linprovements'inGrinding Ma chines,.of which the following is a specification.

My invention relates to grinding nachines of the type in which arevolvable work holder is associated with a rapidly revolving grindingdisk to successively present to the grinding wheel objects to be ground.

One. of the important objects of the invention is to provide improvedarrangement in which a grinding disk is mounted to re volve about ahorizontal axis, and thework holder in the form of a reel is alsomounted I of the table shifting.mecha-nism.

to rotate about a horizontal axis, the. axes being offset so that theholder will successively carry objects across a portion of the grindingwheel. i

Another important object is to provide transversely shiftable tables onthe work carrier and improved means for successively shifting saidtables to present to the grinding wheel objects which have been securedon the table.

Another important object of the invention,

is to provide improved cam and spring mechanism for controlling shiftingof. the

tables. A further object is to provide yielding means for exerting therequired pressure on the tables to cause work thereon to be powerfully.applied against the grinding wheel, together with means for positivelylimiting the travelv of the tables to insure the proper degreeofgrinding.

Another important feature of theinvention resides inmeans forbodilyadjusting the work .holder structure on its supporting shaft and withoutdestroying the adjustment The above and other features of vention areincorporated in afmachine disclosed on the accompanying drawing, it being understood that changes and modifications could readily be madewhich would still come with-in the scope of my invention; On thedrawings, Figure 1 is a plan view, Fig. 2 is a side elevational Viewpartly in section to disclose the gearing train,

Fig. ,3 is a diametrical sectional view, through the work carrier reelshowing the plane 4 '4, Fig. 2,

plane 99, Fig.

' Referring to the drawings, on

micrometer top adjustment and the means for bodily adjusting the reel,

Fig; 4 is an enlarged sectional view on 'Fig. 5 is aplanview of theparts shown in Fig. 4,

Fig. 6 is anenlarged end view from the right of Fig. 2, i v

Fig. 7 is an enlarged sectional iew on plane 77, Fig. 2, p I

.Fig. 8 is an enlarged'sectional view on plane 88, Fig. 2, and I Fig. 9is an enlarged sectional view on Generally speaking, the machinecomprises a grinding disk mounted on ahorij zontal axis, and a workcarrier structure ro- [ta-table on a horizontal axis wh ch isparallelwith but offset from the axis oft-he grind-.

.ing-disk. The work carrier has a plurality of guideways for worksupporting tables and .cam mecha1nisin' .is provided for shifting thesetables at the proper time to carry work thereon into engagement with thegrinding disk, the. work carriers beingcarried with thework carrierstructure .to be swept across the disk while; the disk is rotated. Meansare provided for forcibly though yieldably shifting the work'ho'ldertables to apply the work thereon to the grinding disk and" micrometersetting mechanism is provided for determining the amount of grindingthatis to be performed on the ob ect so thataccurate grinding will result.

the bed plate 1O are. the bearing pedestals 11 and 12 which attheirupper ends journal the shaft 13 on which is isupported; the worksupporting .drum or reel structure designated as a whole At 'the otherend of the machine arethe bearing pedestals 14 and 15 which journal attheir upper. ends the shaft 16 which sup-v U ports the grinding disk17.; vThe shafts 13 and 16are horizontal and parallel but are offsetlaterally adistance as clearly shown in Fig. 1

On the shaft 16 is provided the'pulley 18 by which the shaft may berapidly rotated as bymeans of a belt.

The driving means for the reel R are clearly shown in Figs. 2, 8 and 9.The transmission trains controlling the rotation of the reel are within.the protecting housing 20 -which forms partqof tlle'machine support mgframework.

v 011 onefof the side walls of the housing is the cylindrical part 21through which extends the drive shaft .22 to be suitably 'journa'led atits end preferably on anti-friction bearing mechanism 23. At the outerend of the shaft is the driving pulley 24 and at the inner end of theshaftis the bevel pinion 25. The pinion 'meshes with the bevel gear 26secured on the rear end of the shaft 27 which is journa'led in suitablebearing boxes 28 and 29 supported on the intermediate 'walls 30 and 31of the housing structure-20. The shaft 27 is horizontal and "extends atright angles to the shaft 22 and at its front end carries the gearpinion A countershaft 33 extends parallel alongside of the shaft 27 andis journals-d in suitable bearing structures 84 and 35 supported on theintermediate walls 30 and 31. At its front end the shaft 33 carries thespur gear 36 which meshes'with the gear pinion 32. The gear and pinionare within the compartment 137 in front of the wall 31 which compartmentis accessible by virtue of the removable cover 38 so that the gear andpinion may be readily changed to "adjust the transmission relationbetween the shafts 27 and '33.

Between the bearingstructures 8'4 and 35 the shaft '33 carries the worm39 which meshes with the worm wheel-40 rotatable on the shaft 41.This-shaftis above the shafts .27 and 33 and extends horizontally atright angles to such shafts and is suitably journaled inbearingstructures 42 and 43 in the side walls of the housing "frame 20.At its outer end the shaft 41 supports the gear pinion 44 which mesheswith "the gear wheel 45 secured to the reel shaft 13 and protectedwithin the housing 46. Through the gearing train just described the reelshaft is slowly but powerfully driven.

Clutch -mechanism is provided for controlling the rotation of the reel.On the shaft 41 is splined the clutch collar 47 which has the annulargroove 48 for receiving the pins 49 extending from the fork frame 50which is secured to the shaft 51 to swing when the shaft is rotated bymeans of its lever '52. 'The adjacent :ends of the clutch collar andgear have clutch projections 53. When the lever 52 is swung in 0nedirection the clutch fork will shift the. collar 'to carry the clutchprojection into engagement so that the shaft-41 will ibeconnected to beretated with the worm wheel 40. When the lever 52 is swung in theopposite direction the parts are unclutched and the worm wheel rotatesidly on the shaft 41 and the carrier is at rest.

,shaft, the reel overlapping the ner wall 57 of each extension is acontinuation of the reel side wall 53 and has the threaded sleeve 58formed thereon parallel with the reel axis for receiving a threadedabutment bushing '59. The sides of each extension are formed bycontinuations of the cylindrical wall of the reel. The ends of the sidewalls have flanges 60 and 61 whose upper faces formthe seats for therespective work holding tables 56. "Strips 62 and G3 are secured to theunder sides of each table 56 and engage against the under sides of theflanges 60 .and 61 to thus hold the table on the extension, the-tablebeing pivoted on the pinGS which extends radially (Fig. A distanceinwardly of'the cam block passageway each table has a .lug

through which extends the stem section :71

of the cam head, the stem section 7 2 being a continuation of thesection 71 but of reduced diameter and extending through the threadedbushing 59 and engagedat its outer end by the abutment nut 73. At thebase of the reduced stem section .72 is the nut 7.4 between which andthe inner end of thebushing 59 is the compression spring 75. On the stemsection 71 between the cam block 67 and the lug 70 is the spring 76. Thespring 75 is thus interposed between the reel frame and the slidabletable and the spring 76 travels with the table. The spring 7 5 islighter than the spring 76 and resists inward travel of the table andtends to shiftthe table and the cam block outwardly so that the the camrail 77 supported on the inner end of the bracket- 78 whichisadjustablymounted on the side of the bearing pedestal 12.

The tables 56 have grooves 79 therein for receiving clamping bolts bymeans of which work or Work holder fixtures may be secured .on thetables. In the arrangement shown the shafts 16 and 13 are horizontal camrollers 68 may engage successively with with the reel shaft in front ofthe grinder grinding wheel a suiiicient distance so that the workcarried on the tables 56 will be swept across the wheel between itsperiphery and axis. As thereel rotates the cam rollers will successivelyencounter the cam rail 77, the result of such engagement being inwardshift of the tables to apply the work thereon against the grindingwheel, the spring '75 being free to shift the tables outwardly afterthey have passed across the grinding field.

The objects to be ground are applied at tables until the work hereon hasbeen fully the front "o'it the machine and are accurately positioned ontheftahles in correspondence with the amount or" grinding desired."Before a roller reaches the cam rail thespring shifts the cam'block'with its stem outwardly with the abutment =heac'l73 against thebushing {59. hen a roller encounters the rail the tables will heurgedpowerfully though yieldably toward theggrinc ling disk through thespring '76and the work on the table will be -ground. The spring 76projects the machine against injury which might re: suitfromirregularities during grindingif the cam r oljler were directly mountedon the work holding table. After a cam roller leaves the cam rail thecorresponcling spring 175 will be free to shift the table outwardly toits normal position. The force of the spring '75 can 'he'readilyadjusted means of the threaded abutment bushing 59.

In order to accurately limit the travel of the work holding tables toinsure accurate grinding, I provide micrometer setting mechanism inconnection with each table. Such'mechanism is clearly shown in Figs. 1,2 and 3. Each table has 2. lug 80 depending therefrom for supporting amicrometer screw '81, which screw carries a micrometer For dial 82 andhas the knurled head "83. each micrometer screw 82 an abutment wall 84%is provided on the reel'framework. 'U-pon turning of the micrometerscrew the pointer '35 will indicate on the 'dial the width of the gap 86between the screw "and its abutment '84:, the widt-hof gap determiningthe amount of grind on the work supported on therespectivetable. In thegap shows. In Fig. 1 the cam roller for the rear table is'in engagement.with the cam rail and'the gap is closed, the micrometer screw abuttingagainst its lug to prevent further movement of the table toward thegrinding wheel; The cam rail is so positioned that the cam block 67 willbe shifted inwardly a greater distance than the adjusted distancebetween the micrometer screws and ahutments. With this arrangement thecompression springs 76 will always exert pressure against the ground,that is, until the micrometer screws engage with the ahutments topositively stop further movement of the tables; In oth r words the throwof the cam blocks by the cam rails is sufiicient to cause enoughcompression energy to he stored in'the spring" 76 that they may exertsufficient grinding pressure until the tables are positively stopped bythe micrometer screws and theirahutments.

suit lole gauge bloc as or lay first securing we; holding fixtures onthe tables o'hjects can be quickly and accurately mounted on the tablesfor accurate grinding, Sometimes, in View of the nature of the work oron account of its irregular shape, parts to be ground may, have toextend radially inwardly across the iunei end of thetahle. i To providefor this I make the reel adjustable as a. whole on its supporting shwtt.Accondngly the hubs-87 and 88 of the reel'ztrame are splined onthesha'tt l3 shown in Fig 4-, and-between the hubs a split collar- 89 isclamped and rigidly secured hy a set screwSO. Journaled in the sidewalls-53 and 54: of the ZGQl frame "is the shaft '91 which threadsthrough the collar 89 'anc'l is held against longitudinal movement bythe' collar 92 and bevel gear 93 secured thereto Journaled in thecylindrical wall of the reel structure and extending at right angles tothe shaft 91 is theshaft 94- which at its inner end carries the bevelgear 95 andat its outeren d has the head 96,:the gear 95 meshing withthe gear 93. Upon turni n g of the "head 96 the shaft 91 will he turneda-nd'the' reel frame will he adjusted onits shaft 13 toward or away fromth'egr-inding wheel. The ree'l frame can thus be readily moved away fromthe grinding wheel to allow for overhanging or projectingparts .oncastings, or the adjustment canalso serve for accurately shifting thereel frameinwardly to compensate for grinding :wear -on the grindingwheel.

In order to maintain the proper relationship between the 'cam rollersand, the cam rail, the rail supporting bracketYS is-shifted with thereel frame during adjustment thereof. The huh 88 is provided with theannular groove 97 into which-extends the arm 98 on the bracket 78, andthe bracket has the slots 99 350i its bolt-s 100. Before adjustment ofthe reei't'rame is made the bolts 100 are loosened so that the bracket78 may shift, and after adjustment the bolts are again tightened. Thecamming adj ustment between the bracket 78 and the/respective workholding tables will therefore he n'iaintained during any adjustment ofthe reel frame.

outlet 102 on this housing may he'connected hyfpipe 108 with asuction'device for conveying away the grinding dust.

V The operator stands in front of the 'Hl21 chine and applies the workto the supporting tables. Usually, work supporting fir;- tures arepermanently attached on the tables into which the objects to be groundcan be quickly andaccurately clamped in proper position with referenceto the grinding wheel. If necessary the operator can quickly stop thework supporting reel by swinging the lever 52 which controls the clutchmechanism already described. As the reel revolves comparatively slowlythe micrometer screws 81 can be set while the reel is revolving, and thebodily adjustment of the reel structure toward or away from the grindingwheel can also be readily made while the reel is revolving by turningthe head 96 of the adjusting mechanism. The machine as a whole is ofsimple and economical construction and is very efiicient.

I claim as my invention:

1. A grinding machine having, in COl11-' bin-ation, a grinding elementrotatable on a horizontal axis, a cylindrical drum having a plurality oflongitudinal ways on its peripheral surface, said drum being rotatableon a horizontal axis oflset from the axis of said grinding elementwhereby said drum and said element will partially overlap, fixtures onsaid vavs for su mortin a 3lurality of work blanks at various stationsabout the periphery of said drum, means including a cam for effecting arelative movement of said grinding element and one of said fixturestoward each other when said fixture is carried across the face of saidelement, and resilient means for opposing said movement.

2. In a grinding machine, the combination of a grinding wheel, a worksupporting structure, a work holding table shiftable on said structure,means for moving said structure to position the table in front of saidwheel with an object thereon against said wheel ready to be ground, astationary lug on said table, a shiftable block there-on, an elasticmember between said lug and block,

and means engaging with said shiftable block during movement of saidstructure whereby energy is stored in said elastic member and saidenergy expended in forcing said table toward the grinding wheel wherebywork thereon is ground.

3. In a grinding machine, the combination of a grinding wheel, aworksupporting structure, a work holding table shiftable on said structure,means for moving said structure to position the table in front of saidwheel with an object thereon against said wheel ready to be ground, astationary lug on said table, a shiftable block thereon, an elasticmember between said lug and block, means engaging with said shiftableblock during movement of said structure whereby energy is stored in saidelastic member and said energy expended in forcing said table toward thegrinding wheel whereby work thereon is ground, and adjustable means forlimiting the movement of said table toward said wheel.

A grinding machine having, in combination, a grinding element, a worksupporting drum mounted in overlapping relation with said element, saiddrum having a plurality of wayson its periphery for supporting series ofwork blanks at different stations around said drum, means forautomatically and selectively effecting a relative movement of each workblank and the grinding element toward each other when said work blank iscarried opposite said element, means for limiting the extent of saidmovement and means for separating said grinding element and said workblank after the grinding operation is completed.

5. In a grinding machine, the combination of a grinding wheel, a worksupporting structure, a work holding table shiftable on said structure,means for moving said structure to posit-ion said table in front of thegrinding wheel to present work thereon to said wheel, a. light springtending to shift said table out, a lug on said table, a block on saidtable, a compression spring between said lug and block, and a cam meansin the path of said cam block when said structure is moved to positionsaid table, engagement of said shiftable abutment with said cam meanscausing said compression spring to be compressed and said table shiftedinwardly against the force of said light spring to yieldingly press workon the table against the grinding wheel.

(3. In a grinding machine, the combination of a grinding wheel, a worksupporting structure, a work holding table shiftable on said structure,means for moving said structure to position said table in front of thegrinding wheel to present work thereon to said wheel, a light springtending toshift said table out, a lug on said table, shiftable block onsaid table, a compression spring between said lug and shiftable block, astationary rail in the path of said'shiftable block when said structureis moved to position said table, engagement of said shiftable block withsaid stationary rail causing said compression spring to be compressedand said table shifted inwardly against the force of said light springto yieldingly press work on the table against the grinding wheel, andadjustable means for limiting the inward movement of said table.

7. In a grinding machine, the combination of a grinding wheel, a worksupporting structure movable in a direction parallel with the grindingface of said wheel, a work holding table shiftable on said structure ina direction at right angles to the grinding face, movement of saidstructure serving to position said table in front of the ital grindingface to bring work thereon into grinding position, a cam bloclntraveling with said structure, a compression spring between said blockand said table, a:v cam; in

the path of said block when said structureis moved to positionysaidtable, engagementof said cam and block causingvcompression of saidspring and yieldab'lel inward: .inovement of said table to presswonkithereon against the grindingwhee-l, andrmeans for bodily adjustingsaid structure in: a direction at right anglesto thewgrind ing face ofsaid grinding wheel." I

8. In a grindinginach ine,the combination of a grinding wheel-, a worksupporting structure movable-in a direction: parallel with the grindingface ofsaid' wheel, a. work holding-table shift'able' on: theperipl'iery of said structure in direction at r'ight ang les to thegrindii'ig face, movement: of sa -id structure serving to position saidtablefin the grinding dept-h whereby said table will be yieldably forcedby the relaxation of said spring to press the work against the grindingwheel until the table is stopped and the worn has been fully ground.

9. In av grinding machine, the combination of a grinding wheel, a shaft,a work supporting structure on said shaft adapted to rotate therewith ina plane parallel with the grinding face of said wheel, work holdingtables shiftable' transversely on said structure in a direction at rightanglesto the grinding face, revolving of said structure serving tosuccessively position said tables in front of the grinding face to bringWork thereon into grinding position, cam mechanism effective duringrevolving of said structure to shift the tables inwardly afterpositioning thereof to thereby apply 'the work to the wheel to beground, said supporting structure being longitudinally shiftable on saidshaft, an abutment fixed on said shaft against longitudinal move mentthereon, and an adjusting train between said abutment and said structureoperable to shift said structure longitudinally on said shaft.

10. In a grinding machine, the combina tion of a grinding wheel, a worksupporting frame, work holding tables reciprocable on said frame, saidframe being revolvable to cable toward and away from the grinding Aposition: said! tables in) front ofithe 'gniznd wheel to present workthereon to the grinding face, earnengagang. means: for each table; a camrail: supported; imthe patliwofi said camengaging. means when saidsupporting frame revolves whereby saidtablesgare successively shifted;inward-1y to, cause work; thereon to! be applied to. g the grindingwheel,Ills/a118,. 0 bodily adjusting said supportingairame Q ward andaway from; the grindingin r and a connection betweenisaitli canrrail andid framefor causing said rail toobe. sh fted with. said frame; duringbodily adjustm n thereof whereby the camming; {relation be tween sa d.-rail: andthe tables came-engaging nieansismaintained's. v

a 1'1.:- 111i a, grlndlng'; machine; on the-.clafisi escribed; the,combinationof a; grindingwheel, a. work supporting frainer,-,'. Work:holding tables havingiwoiik-retaining. gnootlcsiall lt-bing shift-ableoin the peripheny ofrsa'icl; frame, SillCl: frame being-resolvable tosuccess wheel and said tables beingi sllif table" to:

ward and away frlomrthe; grindillg face 1:

present work thereto; a,movablc bloumfdl" each table, a compressionspring between each table and its movable block, a cam posi-. tioned inthe path of said movable blocks when said supporting frame revolveswhere by said springs are successively compressed to have energy storedtherein to be expended in yieldably forcing the tables toward thegrinding face to cause workthe-reon to be ground, and adjustable stopmechanism for each table for limiting the inward movementthereof by theassociated sprin 12. A grinding machine having, in combination, agrinding disk rotatable on a horizontal axis, a work supporting framerevolvable on a horizontal axis offset from the axis of the grindingdisk whereby said frame and disk will only partially overlap, radialextensions on said frame, seats formed on said extensions, transverselyshiftable tables mounted on said seats, and means for shiftingsaidtables when in overlapping position with reference to said grinding diskwhereby work on said'tables will be "presented to said disk to beground.

13. A grinding machine having, in combination, a revolving grindingwheel, a cylindrical work supporting frame, radial extensions on saidframe formed by continuations of the cylindrical wall of said frame,flanges on said extensions, work supporting tables mounted on saidflanges and adapted to be successively carried by said frame intogrinding position with reference to said wheel, and means for shiftingsaid tables when in such grinding position whereby work thereon ispresented to the grinding wheel. I

14. A grinding machine having, in combination, a rotatablegrindingwheel, awork supporting structure, a work holding table slidable on saidstructure toward and away from said wheel, a stationary lug on saidtable, a second lug having a passageway therethrough on said table, acam block slidable within said passageway and having a stem passingthrough said first mentioned lug, spring means on said stem and betweensaid lugs, and cam means for compressing said spring means to force saidtable against said wheel.

15. A grinding machine having, in combination, a grinding wheel, arevolvable sup porting frame having ways on its periphery, a pluralityof transversely shiftable work supporting tables on said ways and havinggrooves for securing work thereto, said tables being adapted to becarried into grinding position with reference to said wheel, and meansfor shifting said tables along said ways when in such grinding positionwhereby work thereon is presented to the grinding wheels.

16. A grinding machine having, in com bi'nation, a grinding wheel, amovable work supporting structure, a work holding table slnftable onsaid structure, resilient means tending to hold said table outward withre spect to the grinding wheel, resilient means for pressing said tableagainst the grinding wheel, means for limiting the movement of saidtable toward the grinding wheel, and means for limiting theeffectiveness of said first-mentioned resilient means in moving thetable outwardly.

17. A grinding machine having, in combination, a grinding wheel, ashaft, a work supporting frame slidably mounted on said FREDERIO E.GARDNER.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,530,488, grantedMarch 24, 1925, upon the application of Frederic E. Gardner, of Beloit,Wisconsin, for an improvement in Grinding Machines, errors appear in theprinted specification requiring correction as follows: Page 3, line 20,for the Word projects read protects; page t, line 95, claim 5, strikeout the Word cam, and line.97, for shiftable abutment read b10073; samepage, line 127, claim 7, after the Word. on insert the Words the outerperiphery of; page 5, line 2,'claim 7, after the article a strike outthe Word cam; and that the said Letters Patent should he read With thesecorrections therein that the same may conform to the record of the casein the Patent Otfice.

Signed and sealed this 12th day of May, A. D. 1925.

[SEAL] KARL FENNING,

Acting Commissioner of Patents.

